Tankless Natural Gas Water Heater Project Notes

- Rinnai brand the most popular
- Qualifies for Fed Tax Credit $300:
   To qualify: energy factor>0.82, thermal efficiency>90%, boiler AFUE>95
- Arizona does not offer a rebate program
- 9.4gpm Rinnai R94LSi is around $1k + install
- R94LSi: controller with 98F-140F range, assuming winter inlet water at 50F then at 98F setting it can handle 6.6gpm, total hardness upper limit = 200mg/L (Tucson inlet avg is 200mg/L! hard water), total mineral upper limit  = 500mg/L (Tucson inlet avg is 450mg/L), unit weight = 50lbs, 10"x14"x 23"